Do not call free handler for client if init does not complete.

libguac/include/client.h

@@ -287,6 +287,9 @@ struct guac_client {
      * by the proxy, and any data allocated by the proxy client should be
      * freed.
      *
+     * Note that this handler will NOT be called if the client's
+     * guac_client_init() function fails.
+     *
      * Implement this handler if you store data inside the client.
      *
      * Example:

libguac/src/client.c

@@ -210,7 +210,7 @@ guac_client* guac_client_plugin_get_client(guac_client_plugin* plugin,
     client->__next_buffer_index = -1;
 
     if (plugin->init_handler(client, argc, argv) != 0) {
-        guac_client_free(client);
+        free(client);
         return NULL;
     }